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Inventory - Results of Discounted Cash Flow Analysis (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Continuing Operations |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Impairment Charges | $ 0 | $ 59
Continuing Operations | Unallocated |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Impairment Charges | 0 | 0
Continuing Operations | West Segment |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Impairment Charges | 0 | 46
Continuing Operations | East Segment |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Impairment Charges | 0 | 13
Continuing Operations | Southeast Segment |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Impairment Charges | 0 | 0
Discontinued Operations |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Impairment Charges | $ 0 | $ 0

X
- Definition Impairment of Inventory, Projects in Progress + References No definition available. + Details
Name: | bzh_ImpairmentOfInventoryProjectsInProgress
Namespace Prefix: | bzh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstateWriteDownOrReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration